PVC product and method for treating surface thereof

Abstract

Disclosed is a method for treating a surface of a PVC product. A PVC product including PVC and plasticizer is provided. A surface of the PVC product is treated by an aqueous solution of a crosslinking agent and a first phase transfer catalyst to form a first surface treated PVC product. The surface of the first surface treated PVC product is treated by an aqueous solution of an aqueous free radical initiator and a second phase transfer catalyst to form a second surface treated PVC product. As such, the release of the plasticizer from the PVC product to an environment is inhibited.

What is claimed is: 
     
       1. A method for treating a surface of a PVC product, comprising:
 providing a PVC product including PVC and a plasticizer, 
 treating a surface of the PVC product by a first aqueous solution of a crosslinking agent and a first phase transfer catalyst to form a first surface treated PVC product; and 
 treating the surface of the first surface treated PVC product by a second aqueous solution of an aqueous free radical initiator and a second phase transfer catalyst to form a second surface treated PVC product. 
 
     
     
       2. The method as claimed in  claim 1 , wherein the concentration of the crosslinking agent in the aqueous solution ranges from 0.03M to 3M and the concentration of the first phase transfer catalyst in the aqueous solution ranges from 0.1 wt % to 10 wt %. 
     
     
       3. The method as claimed in  claim 1 , wherein the step of treating the surface of the PVC product by the first aqueous solution to form a first surface treated PVC product is performed at a temperature ranging from 60° C. to 100° C. 
     
     
       4. The method as claimed in  claim 1 , wherein the concentration of the aqueous free radical initiator in the aqueous solution ranges from 0.1 wt % to 20 wt %, and the concentration of the second phase transfer catalyst in the aqueous solution ranges from 0.1 wt % to 10 wt %. 
     
     
       5. The method as claimed in  claim 1 , wherein the step of treating the surface of the first surface treated PVC product by the second aqueous solution to form a second surface treated PVC product is performed at a temperature ranging from 60° C. to 100° C. 
     
     
       6. The method as claimed in  claim 1 , wherein the crosslinking agent comprises dithiocarbamate. 
     
     
       7. The method as claimed in  claim 1 , wherein the aqueous free radical initiator comprises persulfate, azo compound, or combinations thereof. 
     
     
       8. The method as claimed in  claim 1 , wherein the first and the second phase transfer catalyst comprises tetraalkylammonium halide. 
     
     
       9. The method as claimed in  claim 1 , wherein the release of the plasticizer to an environment is inhibited by the second surface treated PVC product.